Pop gauge



March 25, 1930.

c. J. MANUEL POP GAUGE Filed April 2, 1929 Patented Mar. 25, 1930 UNITED .STATES- PATENT OFFICE CHARLES J. MANUEL, OF LA CROSSE, WISCONSIN, ASSIGNOR, BY MESNE ASSIGNMENTS;

TO MOTO METER GAUGE & EQUIPMENT CORPORATION, OF LONG ISLAND CITY, NEW YORK, A CORPORATION OF DELAWARE ror GAUGE Application filed a ina,

This invention relates to an improvement in relief valves for pressure gauges, particularly that type of pressure gauge which is employed in connection with 're'ssure cookers and similar appliances, main object is to dispense with complicated parts'and to combine in one instrument an automatic and p a manually operated relief valve, 'of such parts, accuracy of movement, accessibility of parts, prevention of condensation of vapors on the dial glass and permanent calibration thereby dispensing with re-calibr'ation when parts are re-ass'embled. By reason of the 5 vapors caused by the cookers entering the relief valve chamber 'it has-been desirable to protect the .valve mechanism from the ac-. tion of these vapors and that is acomplished by properly positioning the valve.

the blow-off hole is a vantageously positioned, being permanently located in the socket proper in the stationary rear wall at the back of the gauge. The valve is also 5 preferably positioned'so as to be prqt t d cm the deleterious efiects from the fumes and vapors passing from'the cooker into the valve chamber and the valve is preferably formed in two parts such that they can be 407 readilytaken apart and readily re-assembled.

The valve is operated automatically by an excessive pressure and can also be manually operated and held in its predetermined open osition with little or no danger of the valve mg locked by the vapor pressure, and in 1929. Seria1 1i'o.-351,915.

working position in such manner that in re. assembling the parts the artisan will not in the drawings Fig. 1 is an elevational view showing parts in section; Fig. 2 is a sectional; view and Fig. 3 a detail view showing the position of the parts after a manual 'mani 11- lation of the valve. Fig. 4 is a sectional new v of a modification wherein the valve is at the bottom of the socket.

The gauge is of the type having a casing 1, Bourdon tube 2', pointer 3 and connecting link 4, one end of the tube being anchored in the usual way to the socket 5, with the tube passage 6 extending from the interior In general, the'arran ement is such that,

range of pressures and temperatures as is desired and itfmay also be arranged to indicate when the pressure or temperature, has that the relief valve reached such a point should be manually operated.

The socket 5 is; formed with a lateral va- -.por or air passage 8{ connecting with the' tube passage 6 (Fig.1) and is alsoflformed with a valve sea't9. The bore ofthe so ket is reduced at 10 and has an enlarged po 1 ion 11 connecting with'said reduced portion to form a chamber forthe reception of the two part valve hereinafter described. The socket addition the valve is calibrated for proper bis also formed with a blow-ofi'passage 13,

which is positioned in the rear wall of the socket (Fig. 2) and is adjacent said valve seat 9 formed in the w'all of the socket 5.

The valve consists of three parts (1) an enlarged portion 16, (2) a reduced portion 15, and (3) an inner regulating member. The;reduced portion fits within the socket 5, its inner end contacting against the valve seat 9 formed on the walls of the socket 5.

In Fig. 2 the valve is shown in its normally closed position and in this position the shoulder 17 formed by the enlarged and reduced portions rests upon the outer edge of the socket. The socketvmember has a projecting ledge 18 (Fig. 3) which normally contacts against the flange 19 which projectslaterally from the portion 14, being formed by cutting away a portion of said part 14. In this normal position of the parts the blow oil passage 13 will be cut off from the passage 12, the normal connection to the gauge being from passage or inlet 12 to the passages 8 and 6. Whenever, it is desired to open manually the blow ofi passage 13, it is only necessary to raise the socket 5 until the gauge 1 intermediate the reduced screw threaded end 21 andthe enlarged portion 24 of said member and this shoulder forms a fixed stop which constitutes means for the calibration of the instrument, as hereinafter explained. The

' parts 14 and 20 constitute when assembled a three part valve structure. The outer notched end 22 is adapted to be manipulated by any ordinary tool for screwing the elongated member 20 to its proper calibrated position.

The coil spring 25 encircles the enlarged shank of member 20, the inner spiral bearing against an inner shoulder 26-formed in the bore of valve 14 and'the outer spiral contacting against the shoulder 27 of member 20 (Fig, 2), Consequently, the spring can be set at a predetermined pressure for holding the valve against the seat 9 and when that pressure is reached the socket 5 and cooperating member 20 will be lifted against the tension of the spring disengaging the valve from the valve seat and thereby opening up the inlet to the outside air thereby blowing off the excessive pressures. The transverse passage 28 connects with the longitudinal passage 29 (Fig. 1) forming a continuous passage from the inlet 12 to said passage 8. The blow off opening 13 is so related to the other parts that the valve completely opens up this blow off opening before it is manually thrown to open position, which will prevent the valve being automatically locked in open position by the vapor pressure. As lmretofore explained, the parts can be so proportioned as to cause the spring to be set at a predelernlined pressure when the member :2() is turned to a point where the shoulder 23 \\'lll act as a stop to preventany further turning thereof, and whenever the parts are reassembled this stop 23 will continue tofunction as a means of calibrating the instrument or re-se tting the spring to the proper tension for automatic release.

It is apparent that this combined automatic and manual valved instrument has a minimum of parts, consisting as it does of the socket and three other parts comprising the valve proper 14, the elongated member 20 with the reduced screw threaded end and the coil spring 25, and all of these parts can be readily disassembled and scoured by boiling and thereafter be readily re-assembled without changing the original calibration. In this manner the combined instrument is made compact having its overall length considerably reduced.

Referring to Fig. 4, the parts are so arranged that the danger of the condensed vapors from the cooker clogging and interfering withthe operation of the valve is reduced to a minimum. This is due to the valve being positioned so that the vapors cannot enter the valve chamber or passages until the valve is raised from its seat, and when that occurs the pressure will be great enough to relieve the chamber and passages of those. vapors whichwill be forced through the blow off passage 13.

The normal passage is through the valve 20 as indicated near the central portion of said valve, but when the valve is raised from the seat 9 an additional passage is opened through the chamber to passage 13.

Without further analysis, the foregoing "willso fully reveal the gist of this invention that others can. by applying current knowledge, readily adapt it for various utilizations by retaining one or more of the features that, from the standpoint of the prior art,.fairly constitute essential characteristics of either the generic or specific aspects of this invention and, therefore, such adaptations should be, and are intended to be, comprehended within the meaning and range of equivalency of the following claim.

Having thus revealed this invention, I claim as new and desire to secure the following combinations and elements, or equivalents thereof, by Letters Patent of United States A relief valve for a gauge casing, comprising a. two part valve structure slidingly mounted with a reduced part projecting within said casing, a valve seat formed within said casing, an inner regulating member adjustios ably mounted in said casing,'a pressure means positioned between said members a stop on said inner member for determining the amount of pressure exerted b said pressure means upon' said outer mem er projecting flanges on said casin and said vafve for holding said outer mem er after same has been retracted and turned and a blow ofi passage capable of bein opened by the retraction of said outer mem er.

In witness whereof, I have hereunto subscribed my name. i e

CHARLES J. MANUEL. 

